what is the focus distance of a combined lens made by combining concave lens of 20cm focus distance placed in contact with a convex lens of 30cm focus distance? whether this combination is convergent lens or divergent?
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As we all know that the focal length of the convex lens is always positive as it behaves as a converging lens because it causes the light ray to converge at one point from the axis called as principal focus of the lens. Therefore, f1 = 30 cm. Focal length of the concave lens = 20 cm.
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